I2C With 3,3 Volt

[nomad]

curious, but doesn't PBP run the clock and data as open collector? (playing with tris).
the 628a doesn't have i2c hardware so would have to be done by PBP.
as I've seen the define to make the clock bipolar I've wondered about that.
and reading the lib seen :

i2chigh
      ifndef I2C_INTERNAL
        bsf     FSR, 7          ; 1 Point to TRIS
      endif
        iorwf   INDF, F         ; 1 Set high (input)

or similar all about the i2c routines.

if so, then pullups to 3.3v appears to be all that's needed.?
(assuming the pic recognises 3.3v as a high)

maye that's why Acetronics said

But just verify you use TTL inputs of the PIC and not Schmitt trigger ones ...

Something I'm missing?